The crime scene was about a block away from the Port Authority's East Busway and the Pittsburgh Faison K-5 school.

Dertetka Howard said she rushed home after getting a call from her daughter.

"It's really scary. I hear about it all the time down here, but never this close," said Howard. "She didn't know what happened. She just heard the gunshots and was telling her sisters to get down."

Walker's mother, Nancy, is pleading for justice as she prepares to bury her third and final child. She said her church will help her get through this latest tragedy.

"I just never thought that would be the last time I talked to my child. This is just sad," she said.

A father of four, Walker went to Westinghouse High School in Homewood and community college, then became a contractor, his mother said. He had been working on the Albion Street property for "a while," according to his mother, who said she was not aware of any problems he was having there.

Also known as "Pookie," Walker was not into violence, and neither was the other victim, with whom he had been best friends since elementary school, Nancy Walker said.

"He wasn't a person [who would] get out there and fuss and argue. He wasn't that type of person. He was a good person," she said.

Pittsburgh homicide detectives were trying to interview Watson in the hospital about who shot him. They want to know if the victims knew the killer.